Clay Township is one of 13 townships in St. Joseph County, in the U.S. state of Indiana. As of the 2020 census, its population was 34,235.
According to the United States Census Bureau, Clay Township covers an area of ; of this, (99.28 percent) is land and (0.72 percent) is water.
(This list is based on USGS data and may include former settlements.)
The township contains Stuckey Cemetery.